Tucked behind the Museum of the Works at the Santa Chiara Church and Monumental Complex is a 1st century AD Roman thermal bath complex, the most complete and intact example of a Roman era spa in Naples. Similar to those found in Pompeii and Herculaneum, the remains were discovered after the tragic bombings of Santa Chiara during WWII, but were not excavated until the 1980s.

Arranged in an “L” shaped plan, the complex was built on two levels and fed by the Serino Aqueduct. While the calidarium (hot bath) has yet to be uncovered, the hypogeum (closed to visitors), two tepidaria (warm baths), a laconicum (dry sauna), a frigidarium (cold bath), an octagonal bath, and a pool have been excavated.

Entrance to the bath complex is from the Museum of the Works, located in the southwest corner of the Majolica Tiled Cloister. The entry fee includes access to the Cloister, the Neapolitan Presepe Room, and Museum of the Works.